Authorities say that rescue workers continue to search for the missing and assist residents in town outside of Medellin.

At least 11 people have been killed and 15 remain missing after a landslide in the city of Bello in Colombia’s northwest, according to authorities.

Evacuation orders and rescue efforts continue a day after the landslide, with government officials warning that heavy rains pose an ongoing threat to the area around Medellin, Colombia’s second-largest city.

“We continue to support emergency and rescue work in Bello, where 11 people have sadly been reported killed, at least 15 are missing, and more than 1,500 people are in shelters,” Medellin Mayor Federico Gutierrez said in a social media post on Wednesday.

Floodwaters overwhelmed local waterways on Tuesday during the early morning hours while residents were asleep.